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Reliability Upgrading of Long Period Component of Strong Ground Accelerograms and their Applications to Large Scale Structures

强地面加速度图长周期分量的可靠性提升及其在大型结构中的应用

基本信息

批准号：
59850079
负责人：
TOKI Kenzo
金额：
$ 4.1万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1986
项目状态：
已结题

项目摘要

When response spectra determined from SMAC accelerograms are compared with that from other kind of seismographs, the former gives larger value for the period range over about 5 second than the latter. The response spectrum determined from a SMAC accelerogram recorded at Shinagawa is compared with the acceleration response spectrum from SAMTAC which is a digital type accelerograph. While both spcetra almost coincide for the shorter period range, the response spectrum for SMAC record quite differs from that for SAMTAC record.In order to investigate the recording characteristics of longer period range of SMAC accelerograph, a SMAC accelerograph was shaken on a shaking table with other seismometers and displacement meters. The shift and fluctuation are induced in a SMAC record and these undesirable components have commonly so-called 1/f spectral shape.When a SMAC was driven by the Hachinohe record, the recording pen was shifted at 30 second around low frequency component has also 1/f spectral shape and it is caused by the shift of the pen.The shift and drift of the pen is caused by a coupling between a defect of the link connecting the motion of the pendulum and recording pen and a friction between pen and paper. The pen is pushed by needle and pulled by a spring coil. However, when the friction between the pen and paper is greater than the stiffness of the spring, the pen is not pulled by the spring. Consequently the pen is left behind and the record is shifted. Therefore, the drift of record must be removerd from each record. A spectrum of noise component was subtracted from the original spectrum under the assumption that the phase remains unchanged.The proposed correction method was applied to a number fo SMAC records and results were compared with records obtained by strong motion seismometer of displacement type. Comparison was done on the acceleration response spectrum and the result was satisfactory.

将SMAC地震动测得的反应谱与其他类型地震仪测得的反应谱进行比较，前者在5秒左右的周期范围内的值大于后者。将在品川记录的SMAC加速度计测得的反应谱与数字加速度计SAMTAC的加速度反应谱进行了比较。为了研究SMAC加速度计在较短周期范围内的记录特性，对SMAC加速度计与其他地震仪和位移计在振动台上进行了振动试验。这种漂移和波动是在SMAC记录中引起的，这些不受欢迎的分量通常具有所谓的1/f频谱形状。当由Hachinohe记录驱动SMAC时，记录笔在30秒内围绕低频分量移动也具有1/f频谱形状，这是由笔的移位引起的。笔的移位和漂移是由连接摆和记录笔运动的链路的缺陷和笔和纸之间的摩擦之间的耦合造成的。钢笔是用针推的，用弹簧圈拉的。然而，当笔和纸之间的摩擦力大于弹簧的刚度时，笔就不会被弹簧拉动。结果，钢笔被留在了后面，记录被转移了。因此，必须从每个记录中消除记录的漂移。在假设相位不变的情况下，从原始频谱中减去噪声分量的频谱，并将所提出的校正方法应用于多个SMAC记录，并将结果与位移式强震地震仪的记录进行了比较。对加速度反应谱进行了比较，结果令人满意。